compatibility with chinese IME（input method editor）

compatibility with chinese IME（input method editor）

1. single click any cell
2. turn on any Chinese IME
3. input "nihao" （你好）
4. we should see that the cell accept the first character 'n' as an english character. In this way, only "ihao" was left in the Chinese IME. The correct behavior should send the whole word to the IME.

Remark: SINGLE CLICK ANY CELL NOT DOUBLE CLICK. For convenience, press tab to move to next cell or single click actions are both frequently used. Ideally, the just focused cell should be able to accept the Chinese character immediately.

BTW, Google has resolved this problem in its Google sheet for a long time.